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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410060e6384df6478d864b0df952a946f746148cc7e96c89520455397c47fa0d' 
  AND token = '2NSmgGs1QDGTcMtkoHp6/DDc4a2lu6ytmC6Yq7v71Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}